EP1777058A2 - Method and apparatus for laser welding thermoplastic resin members - Google Patents
Method and apparatus for laser welding thermoplastic resin members Download PDFInfo
- Publication number
- EP1777058A2 EP1777058A2 EP20060255340 EP06255340A EP1777058A2 EP 1777058 A2 EP1777058 A2 EP 1777058A2 EP 20060255340 EP20060255340 EP 20060255340 EP 06255340 A EP06255340 A EP 06255340A EP 1777058 A2 EP1777058 A2 EP 1777058A2
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- EP
- European Patent Office
- Prior art keywords
- laser beam
- thermoplastic resin
- gas
- members
- laser
- Prior art date
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
- B29C66/824—Actuating mechanisms
- B29C66/8242—Pneumatic or hydraulic drives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
- B29C65/16—Laser beams
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
- B29C65/16—Laser beams
- B29C65/1629—Laser beams characterised by the way of heating the interface
- B29C65/1635—Laser beams characterised by the way of heating the interface at least passing through one of the parts to be joined, i.e. laser transmission welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
- B29C65/16—Laser beams
- B29C65/1629—Laser beams characterised by the way of heating the interface
- B29C65/1654—Laser beams characterised by the way of heating the interface scanning at least one of the parts to be joined
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/001—Joining in special atmospheres
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/001—Joining in special atmospheres
- B29C66/0012—Joining in special atmospheres characterised by the type of environment
- B29C66/0014—Gaseous environments
- B29C66/00141—Protective gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/001—Joining in special atmospheres
- B29C66/0012—Joining in special atmospheres characterised by the type of environment
- B29C66/0014—Gaseous environments
- B29C66/00145—Vacuum, e.g. partial vacuum
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/341—Measures for intermixing the material of the joint interlayer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
- B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
- B29C66/826—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps without using a separate pressure application tool, e.g. the own weight of the parts to be joined
- B29C66/8266—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps without using a separate pressure application tool, e.g. the own weight of the parts to be joined using fluid pressure directly acting on the parts to be joined
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
- B29C66/826—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps without using a separate pressure application tool, e.g. the own weight of the parts to be joined
- B29C66/8266—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps without using a separate pressure application tool, e.g. the own weight of the parts to be joined using fluid pressure directly acting on the parts to be joined
- B29C66/82661—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps without using a separate pressure application tool, e.g. the own weight of the parts to be joined using fluid pressure directly acting on the parts to be joined by means of vacuum
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
- B29C66/832—Reciprocating joining or pressing tools
- B29C66/8322—Joining or pressing tools reciprocating along one axis
- B29C66/83221—Joining or pressing tools reciprocating along one axis cooperating reciprocating tools, each tool reciprocating along one axis
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
- B29C65/16—Laser beams
- B29C65/1603—Laser beams characterised by the type of electromagnetic radiation
- B29C65/1606—Ultraviolet [UV] radiation, e.g. by ultraviolet excimer lasers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
- B29C65/16—Laser beams
- B29C65/1603—Laser beams characterised by the type of electromagnetic radiation
- B29C65/1612—Infrared [IR] radiation, e.g. by infrared lasers
- B29C65/1616—Near infrared radiation [NIR], e.g. by YAG lasers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
- B29C65/16—Laser beams
- B29C65/1677—Laser beams making use of an absorber or impact modifier
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
- B29C65/16—Laser beams
- B29C65/1687—Laser beams making use of light guides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/737—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined
- B29C66/7377—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined amorphous, semi-crystalline or crystalline
- B29C66/73773—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined amorphous, semi-crystalline or crystalline the to-be-joined area of at least one of the parts to be joined being semi-crystalline
- B29C66/73774—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined amorphous, semi-crystalline or crystalline the to-be-joined area of at least one of the parts to be joined being semi-crystalline the to-be-joined areas of both parts to be joined being semi-crystalline
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C66/80—General aspects of machine operations or constructions and parts thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
- B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
- B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B29C66/90—Measuring or controlling the joining process
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- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/93—Measuring or controlling the joining process by measuring or controlling the speed
- B29C66/939—Measuring or controlling the joining process by measuring or controlling the speed characterised by specific speed values or ranges
Definitions
- the invention relates to a method and apparatus for laser welding thermoplastic resin members.
- the invention relates to a method and apparatus for joining a member formed of a transmissive thermoplastic resin that transmits a laser beam with a member formed of an absorptive thermoplastic resin that absorbs a laser beam by melting them.
- the method for laser welding resin parts described in Patent Document 1 is carried out in the following manner: laser beam irradiation is carried out while the vicinity of at least one of the joining end surfaces of a transmissive resin member and a absorptive resin member is under a reduced pressure atmosphere in an irradiation step, wherein joining end surfaces of a transmissive resin member and a absorptive resin member, which have transmissivity and absorptivity with respect to a laser beam as a heat source, respectively, are joined together by heating and melting them.
- Patent Document 1 JP Patent Publication (Kokai) No. 2002-283457 A
- the present invention is made in view of the above problem. It is an objective of the present invention to provide a method and apparatus for laser welding thermoplastic resin members, whereby welding strength upon the welding of resin members can be improved and variation in the welding strength can be reduced. It is another objective of the present invention to provide a method and apparatus for laser welding thermoplastic resin members, whereby reduction in the occurrence of burrs extruded from the welded portion and improved product quality can be achieved.
- thermoplastic members a first member formed of transmissive thermoplastic resin that transmits a laser beam and a second member formed of absorptive thermoplastic resin that absorbs a laser beam are made to come into contact with each other, and contact surfaces of the members are joined by melting using a laser beam.
- the method is characterized in that the first member and the second member are made to come into contact with each other under a reduced pressure atmosphere, and the contact surfaces of the two members are irradiated with a laser beam from the side of the first member.
- thermoplastic resin In the method for laser welding thermoplastic resin according to the present invention, the configuration of which is as described above, a first member formed of transmissive thermoplastic resin that transmits a laser beam and a second member formed of absorptive thermoplastic resin that absorbs a laser beam are made to come into contact with each other.
- the two members are irradiated with a laser beam from the side of the first member that transmits a laser beam, and energy accumulates on the surface of the second member, which does not transmit a laser beam, resulting in heat generation. Due to further laser beam irradiation, the quantity of heat generated increases, the contact surface of the first member is simultaneously heated via the contact surface of the second member, and contact surfaces of the two members become melted, so that the two members are welded together.
- a first member formed of transmissive thermoplastic resin that transmits a laser beam and a second member formed of absorptive thermoplastic resin that absorbs a laser beam are made to come into contact with each other, and contact surfaces of the members are joined by melting using a laser beam.
- the method is characterized in that: the first member and the second member are made to come into contact with each other under an atmosphere containing a gas having low heat conductivity or an inert gas; and the contact surfaces of the two members are irradiated with a laser beam from the side of the first member.
- gas having low heat conductivity is a gas having a heat conductivity lower than that of the air.
- Preferred examples thereof include nitrogen, carbonic acid gas, ammonia gas, and the like.
- inert gas that can be used include rare gases such as helium, argon, and neon. A combination of the aforementioned gases can also be used.
- thermoplastic resin members In the method for laser welding thermoplastic resin members according to the present invention, the configuration of which is as described above, gas inside a casing that accommodates two members subjected to welding is replaced with a gas having low heat conductivity, an inert gas, or the like so that heat diffusion toward the outside of the casing can be suppressed.
- a gas having low heat conductivity, an inert gas, or the like so that heat diffusion toward the outside of the casing can be suppressed.
- melted polymer is slowly cooled, and failure phenomena due to the quenching of the polymer can be avoided, such that the cooling rate can be reduced.
- the degree of crystallinity of the welded portion can be increased, resulting in improvement of welding strength and reduction of variation in strength.
- the apparatus for laser welding thermoplastic resin members is a welding apparatus wherein contact surfaces of a first member formed of transmissive thermoplastic resin that transmits a laser beam and a second member formed of absorptive thermoplastic resin that absorbs a laser beam are joined by melting using a laser beam.
- the apparatus is equipped with a casing that accommodates the first member and the second member, a pressure-reducing means that reduces the pressure inside the casing, and a laser beam generator, whereby at least one of the contact surfaces of the first member and the second member becomes melted.
- the contact surfaces of the two members are irradiated with a laser beam from the side of the first member.
- contact surfaces of a first member formed of transmissive thermoplastic resin that transmits a laser beam and a second member formed of absorptive thermoplastic resin that absorbs a laser beam are joined by melting using a laser beam.
- the apparatus is equipped with a casing that accommodates a first member and a second member, a gas supplying means that supplies a gas having low heat conductivity or an inert gas into the casing, and a laser beam generator, whereby at least one of the contact surfaces of the first member and the second member becomes melted.
- the gas supplying means supplies nitrogen gas, carbonic acid gas, ammonia gas, helium gas, argon gas, or neon gas.
- a gas having low heat conductivity or an inert gas is supplied into a casing that accommodates two members formed of thermoplastic resin when the two members are welded, so that heat conductivity in a space inside the casing is reduced, resulting in the suppression of heat diffusion from polymer that has become melted by heating by laser beam irradiation.
- temperature fluctuations due to the shapes of members or the like can be reduced and the quenching of a melted portion can be prevented. Therefore, the degree of crystallinity of a melted portion can be improved by slow cooling, resulting in the improvement of welding strength and reduction of variation in strength.
- the type of resin used as the transmissive thermoplastic resin that transmits a laser beam is not particularly limited as long as thermoplasticity is imparted to such resin and the resin can transmit a laser beam as a heat source.
- examples of such resin include polyamide (PA) such as nylon 6 (PA6) or nylon 66 (PA66); polyethylene (PE); polypropylene (PP); styrene-acrylonitrile copolymer; polyethylene terephthalate (PET); polystyrene; ABS; polymethylmethacrylate (PMMA); polycarbonate (PC); and polybutylene terephthalate (PBT).
- resin to which a coloring agent or reinforced fiber such as glass fiber or carbon fiber is added according to need may be used.
- the phrase "transmit a laser beam” indicates that laser beam transmissivity is preferably 20% or more, more preferably 50% or more, further preferably 80% or more, and particularly preferably 90% or more.
- the type of resin used as the absorptive thermoplastic resin that absorbs a laser beam is not particularly limited as long as thermoplasticity is imparted to such resin and the resin can absorb a laser beam as a heat source while not transmitting it.
- PA polyamide
- PA6 nylon 6
- PA66 nylon 66
- PE polyethylene
- PP polypropylene
- styrene-acrylonitrile copolymer polyethylene terephthalate
- PET polystyrene
- ABS poly
- resin to which reinforced fiber such as glass fiber or carbon fiber is added according to need may be used.
- the phrase "absorb a laser beam” indicates that laser beam transmissivity is preferably 10% or less, more preferably 5% or less, and further preferably 1% or less.
- a combination of resin used for a transmissive thermoplastic resin member and resin used for an absorptive thermoplastic resin member is a combination of resins compatible to each other.
- examples of such combination include a combination of nylon 6 and nylon 66, PET and PC, and PC and PBT, in addition to a combination of two resins of the same type such as nylon 6 and nylon 6, or nylon 66 and nylon 66.
- the type of a laser beam used for the laser beam irradiation on contact surfaces of two members can be adequately selected based on the relationship between an absorption spectrum of a transmissive resin material that transmits a laser beam and the thickness of the member (transmission length), for example.
- the laser beam include a laser beam generated by an Nd: glass (neodymium 3+ : glass) laser, an Nd: YAG (neodymium 3+ : YAG) laser, a ruby laser, a helium-neon laser, a krypton laser, an argon laser, a H 2 laser, an N 2 laser, or a semiconductor laser. More preferred examples thereof include a laser beam generated by an Nd: YAG laser (wavelength of the laser beam: 1060 nm) and a semiconductor laser (wavelength of the laser beam: 500 to 1000 nm).
- laser output power is 10 to 900 W.
- the output power is less than 10 W, the output power is too low to melt the contact surfaces of the two resin members.
- thermoplastic resin members of the present invention With the use of the method and apparatus for laser welding thermoplastic resin members of the present invention, two members formed of thermoplastic resin can uniformly be welded with high welding strength. In addition, since it is possible to prevent burrs from being extruded from the welded portion, the quality of welded resin members can be enhanced. Further, using a low-output laser, the facility cost of which is low, high welding strength can be obtained even in the case of a resin member having a high melting point, so that variation in the strength can be reduced.
- Fig. 1 shows the configuration of the main part of the apparatus for laser welding thermoplastic resin members according to the present embodiment.
- a first member 2 formed of transmissive thermoplastic resin that transmits a laser beam and a second member 3 formed of absorptive thermoplastic resin that absorbs a laser beam are made to come into contact with each other, and contact surfaces 4 are joined by melting using a laser beam.
- the laser welding apparatus 1 is a welding apparatus wherein the first member and the second member are made to come into contact with each other under a reduced pressure atmosphere, and contact surfaces 4 of the two members are irradiated with a laser beam generated from a laser beam generator 10 from the side of the first member that transmits a laser beam, such that two members 2 and 3 are joined by melting.
- the laser welding apparatus 1 is equipped with a casing 5 that accommodates the first member 2 and the second member 3, and also is equipped with a pressure-reducing means such as a vacuum pump 6 that reduces the pressure inside the casing to a level lower than that of the atmospheric pressure.
- the apparatus is composed in a manner such that the vacuum pump 6 functions to create a reduced pressure environment inside the casing 5, and two members 2 and 3 are accommodated under the reduced pressure atmosphere, such that the members can be welded together.
- the laser welding apparatus 1 is equipped with the laser beam generator 10, whereby at least one of the contact surfaces 4 of the first member 2 and second member 3 becomes melted.
- the laser beam generator 10 is composed of a laser oscillator 11 and a laser head 12 that is connected to the laser oscillator via optical fiber.
- a laser beam irradiated from the laser head is a semiconductor laser beam having a wavelength of 940 nm, for example, and the output power thereof is approximately 10 to 900 W.
- a transfer mechanism 13 that transfers the laser head upon welding at a processing speed of approximately 0.1 to 5 m/min, for example, is connected.
- the transfer means 13 that can appropriately be used is composed in a manner such that: a industrial robot is connected to the laser head 12; members are transferred using a two-dimensional stage or three-dimensional stage; a focal point created by a combination of an optical lens and a mirror is controlled; or a plurality of portions are simultaneously irradiated using a plurality of laser heads.
- the first member 2 is formed with, for example, glass-reinforced nylon 6 as transmissive thermoplastic resin material.
- the second member 3 is formed with, for example, resin material obtained by mixing glass-reinforced nylon 6 with carbon black or a coloring agent. Laser beam absorptivity is imparted to the second member 3 formed of absorptive thermoplastic resin material that has been mixed with carbon black or a coloring agent. In addition, the second member 3 absorbs a laser beam so that the laser energy accumulates within it, resulting in heat generation.
- the laser welding apparatus 1 is equipped with a clamp mechanism 15, whereby pressing force is imparted to two members 2 and 3 so that the members come into tight contact with each other.
- the clamp mechanism 15 prevents the two members from being removed from each other due to volume expansion of the melted portion resulting from melting of the contact surface of at least one member via a laser beam.
- the clamp mechanism 15 functions to achieve uniform welding of two members.
- the clamp mechanism 15 that can be used is composed in a manner such that: two members are pressed against each other via a spring mechanism or the like; two members that have been placed on a base or the like are pressed from above; two members are pressed using fluid pressure such as hydraulic fluid pressure; or two members are pressed using compressed air.
- the laser beam transmissivity of transmissive thermoplastic resin material that constitutes the first member 2 and transmits a laser beam is preferably 20% or more, more preferably 50% or more, further more preferably 80% or more, and particularly preferably 90% or more.
- the laser beam transmissivity of absorptive thermoplastic resin material that constitutes the second member 3 and absorbs a laser beam is preferably 10% or less, more preferably 5% or less, and further more preferably 1% or less. Since the resin material that constitutes the second member 3 almost completely lacks the ability to transmit a laser beam, it can be referred to as non-transmissive thermoplastic resin material.
- the second member 3 absorbs a laser beam while almost completely lacking the ability to transmit a laser beam. As a result, laser beam energy accumulates within it, resulting in heat generation.
- the first member 2 and the second member 3 are made to overlap each other in the casing 5 of the laser welding apparatus 1.
- Two members 2 and 3 are pressed tightly against each other by the clamp mechanism 15.
- the two members are disposed so as to overlap each other in a manner such that transmissive member 2 faces the laser head 12.
- vacuum pump 6 When vacuum pump 6 is operated under such condition, the air in the casing 5 is discharged, resulting in reduction in the pressure inside such the casing.
- the pressure is reduced so as to approach a vacuum state as nearly as possible.
- the pressure preferably ranges from 0 to 1 kPa and more preferably from 0 to 0.1 kPa.
- the laser beam generator 10 is operated to direct laser beam R toward contact surfaces 4 of two members 2 and 3. Then, heat is generated in the vicinity of contact surface 4 on the top side of second member 3 that absorbs a laser beam, since laser beam R is focused on the contact surface using an irradiation lens inside the laser head.
- the vicinity of contact surface 4 of second member 3 becomes melted, followed by melting of the contact surface of the first member 2.
- both melted portions 4a are fused together such that contact surfaces 4 of the first member 2 and second member 3 are fused together.
- the laser head 12 is transferred by the transfer mechanism 13 so that the widths of melted portions 4a are extended. As a result, the melted portions of two members can be continuously formed.
- the laser head 12 is transferred by the transfer mechanism 13 such that all portions subjected to welding become melted. Thereafter, the laser beam generator 10 is halted. After irradiation of laser beam R is halted, melted portions 4a are cooled. At such time, the casing 5 contains rarefied air under reduced pressure conditions so that thermal diffusion is suppressed, which in turn results in suppression of thermal diffusion toward the outside of the system. Thus, the cooling rate of melted polymer is reduced, and the polymer is not quenched but slowly cooled, such that welded portion 4b is formed. Since the melted portions are slowly cooled in such a manner, temperature fluctuations due to the shapes of members can be reduced.
- the first member 2 formed of transmissive thermoplastic resin and second member 3 formed of absorptive thermoplastic resin are made to come into contact with each other under a reduced pressure atmosphere, and contact surfaces 4 are irradiated with a laser beam from the side of the first member 2 that transmits a laser beam, such that two members are welded.
- thermal diffusion toward the outside of the system is suppressed so that melted polymer is slowly cooled.
- temperature fluctuations due to the shapes of members or the like are reduced. Therefore, the degree of crystallinity of the welded portion is improved, resulting in the increased welding strength, and leading to reduction of variations in strength. As a result, occurrence of burrs is suppressed so that welding quality is improved.
- FIG. 2 shows the configuration of the main part of another embodiment of a laser welding apparatus for thermoplastic resin members according to the present invention.
- the present embodiment is characterized in that gas inside the casing that accommodates two members subjected to welding is replaced with a gas having low heat conductivity or an inert gas such that welding is performed.
- gas inside the casing that accommodates two members subjected to welding is replaced with a gas having low heat conductivity or an inert gas such that welding is performed.
- the first member 2 formed of transmissive thermoplastic resin that transmits a laser beam and second member 3 formed of absorptive thermoplastic resin that absorbs a laser beam are made to come into contact with each other, and contact surfaces 4 are joined by melting using a laser beam irradiated from the laser beam generator 10.
- the laser welding apparatus 1A is an apparatus in which the first member and the second member are made to come into contact with each other under an atmosphere containing a gas having low heat conductivity or an inert gas, and contact surfaces 4 of the two members are irradiated with a laser beam from the side of the first member that transmits laser beam, so that two members 2 and 3 are welded.
- the laser welding apparatus 1A is equipped with the casing 5 that accommodates the first member 2 and the second member 3.
- the casing is equipped with a gas supplying means 20 that supplies a gas having low heat conductivity or an inert gas, which is kept in a gas container 21.
- the apparatus is composed in a manner such that gas inside the casing 5 is replaced with a gas having low heat conductivity or an inert gas by the gas supplying means 20; and two members 2 and 3 are accommodated under the environment of a gas having low heat conductivity or an inert gas such that the members are welded. It is not necessary to replace 100% of the gas inside the casing with a gas having low heat conductivity or an inert gas. For instance, 50% or more of the gas inside thereof may be replaced.
- the laser beam generator 10 is composed of the laser oscillator 11 and the laser head 12 that is connected to the laser oscillator via optical fiber.
- the transfer mechanism 13 which transfers the laser head 12 upon welding at a processing speed of, for example, approximately 0.1 to 5 m/min, is connected to the laser head.
- the laser welding apparatus 1A is equipped with the clamp mechanism 15, with which pressing force is imparted to two members 2 and 3 such that they come into tight contact with each other.
- the clamp mechanism 15 is equipped with which pressing force is imparted to two members 2 and 3 such that they come into tight contact with each other.
- Such configuration is equivalent to that in the aforementioned embodiment.
- detailed description is omitted here.
- detailed description regarding the first member 2 and the second member 3 is omitted since the configuration thereof is equivalent to that in the aforementioned embodiment.
- the first member 2 and the second member 3 are made to overlap each other in the casing 5 and two members 2 and 3 are pressed tightly against each other by the clamp mechanism 15.
- Two members are disposed so as to overlap each other in a manner such that the transmissive member 2 faces the laser head 12.
- the gas supplying means 20 is operated so that gas inside the casing 5a is replaced with a gas having low heat conductivity by supplying the gas thereinto, for example.
- a preferred example of such gas having low heat conductivity is a gas having heat conductivity lower than that of the air (0.0221 kcal/mh°C).
- Preferred examples thereof include nitrogen gas (0.0207 kcal/mh°C), carbonic acid gas (0.0125 kcal/mh°C), ammonia gas (0.0188 kcal/mh°C), and the like.
- the laser beam generator 10 is operated under conditions whereby the gas inside the casing 5 is replaced with a gas having low heat conductivity or an inert gas. Then, contact surfaces 4 of two members 2 and 3 are irradiated and heated with laser beam R so that the vicinities of the contact surfaces become melted. Thus, melted portions 4a are formed.
- a gas having low heat conductivity or an inert gas exists surrounding the two members, resulting in the restriction of the quantity of heat diffusion from the melted portions via such gas. Therefore, the polymer of melted portions 4a is not quenched but is slowly cooled so that welded portion 4b is formed. That is, heat diffusion toward the outside of the system is suppressed so that the cooling rate is reduced. As a result, the degree of crystallinity of welded portion 4b is increased, resulting in the improvement of welding strength in the welded portion and the achievement of reduction of variations in strength.
- two members 2 and 3 are made to come into contact with each other under an environment whereby the gas inside the casing 5 is replaced with a gas having low heat conductivity or an inert gas, and the contact surfaces of the two members are irradiated with a laser beam from the side of the first member formed of resin that has laser beam transmissivity, so that the two members are welded together.
- heat diffusion toward the outside of the system is suppressed so that melted polymer is slowly cooled.
- temperature fluctuations are reduced, and the degree of crystallinity of the welded portion is improved, resulting in increased welding strength. Therefore, variations in strength are reduced and the occurrence of burrs is suppressed, so that welding quality can be improved.
- a laser oscillator and a laser head that constitute a laser beam generating means may be incorporated together so as to be disposed movably inside a casing.
- thermoplastic resins general-purpose thermoplastic resins, general-purpose engineering plastics, super engineering plastics, thermoplastic elastomers, and the like can be used, in addition to the thermoplastic resin described above.
- transmissive thermoplastic resin that constitutes the first member and transmits a laser beam has a high transmissivity
- absorptive thermoplastic resin that constitutes the second member and absorbs a laser beam has a low transmissivity.
- a first member made of transmissive thermoplastic resin and a second member made of absorptive thermoplastic resin, which have different laser beam transmissivities, are selected so that it is possible to perform welding, whereby welding strength can be improved and variations in strength can be reduced.
- the present invention can be applied to the welding of various types of resin products or resin components.
Abstract
Description
- The invention relates to a method and apparatus for laser welding thermoplastic resin members. In particular, the invention relates to a method and apparatus for joining a member formed of a transmissive thermoplastic resin that transmits a laser beam with a member formed of an absorptive thermoplastic resin that absorbs a laser beam by melting them.
- In response to the demand in recent years for reducing the weight and cost of components in various fields, such as automobile components, such components are often made of resin materials and formed as resin molded items. When a resin molded item having a complex shape is to be formed, a plurality of component parts of the resin molded item are molded in advance and then jointed together by welding for productivity enhancing purposes.
- As an example of a conventional method for welding such resin molded items, the method for laser welding resin parts described in
Patent Document 1 is carried out in the following manner: laser beam irradiation is carried out while the vicinity of at least one of the joining end surfaces of a transmissive resin member and a absorptive resin member is under a reduced pressure atmosphere in an irradiation step, wherein joining end surfaces of a transmissive resin member and a absorptive resin member, which have transmissivity and absorptivity with respect to a laser beam as a heat source, respectively, are joined together by heating and melting them. - [Patent Document 1]
JP Patent Publication (Kokai) No. 2002-283457 A - In the method for laser welding resin components described above, sufficient joining strength can be obtained without using working jigs even in a case where gaps exist between the joining end surfaces; however, nonuniformity in strength might be found in the welded portions of the two members. That is, melted resin on the contact surfaces disperses widely on the welded surfaces so that the heat generated is diffused. As a result, a difference is created between the welding strength of a resin-filled gap portion and that of a well-welded portion. In addition, such factors might cause the occurrence of burrs of welded resin on the reduced pressure side of the welded portion. Specifically, due to difference between the pressure inside and that outside the case, welded resin is frequently extruded inside the case, resulting in the occurrence of burrs.
- The present invention is made in view of the above problem. It is an objective of the present invention to provide a method and apparatus for laser welding thermoplastic resin members, whereby welding strength upon the welding of resin members can be improved and variation in the welding strength can be reduced. It is another objective of the present invention to provide a method and apparatus for laser welding thermoplastic resin members, whereby reduction in the occurrence of burrs extruded from the welded portion and improved product quality can be achieved.
- To attain the above objective, in the method for laser welding thermoplastic members according to the present invention, a first member formed of transmissive thermoplastic resin that transmits a laser beam and a second member formed of absorptive thermoplastic resin that absorbs a laser beam are made to come into contact with each other, and contact surfaces of the members are joined by melting using a laser beam. The method is characterized in that the first member and the second member are made to come into contact with each other under a reduced pressure atmosphere, and the contact surfaces of the two members are irradiated with a laser beam from the side of the first member.
- In the method for laser welding thermoplastic resin according to the present invention, the configuration of which is as described above, a first member formed of transmissive thermoplastic resin that transmits a laser beam and a second member formed of absorptive thermoplastic resin that absorbs a laser beam are made to come into contact with each other. The two members are irradiated with a laser beam from the side of the first member that transmits a laser beam, and energy accumulates on the surface of the second member, which does not transmit a laser beam, resulting in heat generation. Due to further laser beam irradiation, the quantity of heat generated increases, the contact surface of the first member is simultaneously heated via the contact surface of the second member, and contact surfaces of the two members become melted, so that the two members are welded together. Since the two members come into contact with each other under a reduced pressure atmosphere, the heat generated upon welding is not diffused toward the outside of the system. Thus, melted polymer is slowly cooled so that failure phenomena due to quenching of the polymer can be avoided. Therefore, a uniform welded portion is obtained so that welding strength can be improved and variation in welding strength can be reduced.
- In another embodiment of the method for laser welding thermoplastic resin members according to the present invention, a first member formed of transmissive thermoplastic resin that transmits a laser beam and a second member formed of absorptive thermoplastic resin that absorbs a laser beam are made to come into contact with each other, and contact surfaces of the members are joined by melting using a laser beam. The method is characterized in that: the first member and the second member are made to come into contact with each other under an atmosphere containing a gas having low heat conductivity or an inert gas; and the contact surfaces of the two members are irradiated with a laser beam from the side of the first member. Preferably, such gas having low heat conductivity is a gas having a heat conductivity lower than that of the air. Preferred examples thereof include nitrogen, carbonic acid gas, ammonia gas, and the like. Examples of inert gas that can be used include rare gases such as helium, argon, and neon. A combination of the aforementioned gases can also be used.
- In the method for laser welding thermoplastic resin members according to the present invention, the configuration of which is as described above, gas inside a casing that accommodates two members subjected to welding is replaced with a gas having low heat conductivity, an inert gas, or the like so that heat diffusion toward the outside of the casing can be suppressed. Thus, melted polymer is slowly cooled, and failure phenomena due to the quenching of the polymer can be avoided, such that the cooling rate can be reduced. As a result, the degree of crystallinity of the welded portion can be increased, resulting in improvement of welding strength and reduction of variation in strength.
- In addition, the apparatus for laser welding thermoplastic resin members according to the present invention is a welding apparatus wherein contact surfaces of a first member formed of transmissive thermoplastic resin that transmits a laser beam and a second member formed of absorptive thermoplastic resin that absorbs a laser beam are joined by melting using a laser beam. The apparatus is equipped with a casing that accommodates the first member and the second member, a pressure-reducing means that reduces the pressure inside the casing, and a laser beam generator, whereby at least one of the contact surfaces of the first member and the second member becomes melted. The contact surfaces of the two members are irradiated with a laser beam from the side of the first member.
- In the apparatus for laser welding, the configuration of which is as described above, pressure inside the casing that accommodates two members is reduced when two members formed of thermoplastic resin are welded, so that the air, through which heat is diffused, become rarefied, resulting in the suppression of heat diffusion from polymer that has become melted by heating by laser beam irradiation. Thus, temperature fluctuations due to the shapes of members or the like can be reduced and the quenching of the melted portion can be prevented. Therefore, the degree of crystallinity of the melted portion can be improved by slow cooling, resulting in improvement of welding strength and reduction of variation in strength.
- Further, in another embodiment of the apparatus for laser welding thermoplastic resin members according to the present invention, contact surfaces of a first member formed of transmissive thermoplastic resin that transmits a laser beam and a second member formed of absorptive thermoplastic resin that absorbs a laser beam are joined by melting using a laser beam. The apparatus is equipped with a casing that accommodates a first member and a second member, a gas supplying means that supplies a gas having low heat conductivity or an inert gas into the casing, and a laser beam generator, whereby at least one of the contact surfaces of the first member and the second member becomes melted. Preferably, the gas supplying means supplies nitrogen gas, carbonic acid gas, ammonia gas, helium gas, argon gas, or neon gas.
- In the laser welding apparatus, the configuration of which is as described above, a gas having low heat conductivity or an inert gas is supplied into a casing that accommodates two members formed of thermoplastic resin when the two members are welded, so that heat conductivity in a space inside the casing is reduced, resulting in the suppression of heat diffusion from polymer that has become melted by heating by laser beam irradiation. Thus, temperature fluctuations due to the shapes of members or the like can be reduced and the quenching of a melted portion can be prevented. Therefore, the degree of crystallinity of a melted portion can be improved by slow cooling, resulting in the improvement of welding strength and reduction of variation in strength.
- In the laser welding method and apparatus according to the present invention, the type of resin used as the transmissive thermoplastic resin that transmits a laser beam is not particularly limited as long as thermoplasticity is imparted to such resin and the resin can transmit a laser beam as a heat source. Examples of such resin include polyamide (PA) such as nylon 6 (PA6) or nylon 66 (PA66); polyethylene (PE); polypropylene (PP); styrene-acrylonitrile copolymer; polyethylene terephthalate (PET); polystyrene; ABS; polymethylmethacrylate (PMMA); polycarbonate (PC); and polybutylene terephthalate (PBT). In addition, resin to which a coloring agent or reinforced fiber such as glass fiber or carbon fiber is added according to need may be used. The phrase "transmit a laser beam" indicates that laser beam transmissivity is preferably 20% or more, more preferably 50% or more, further preferably 80% or more, and particularly preferably 90% or more.
- The type of resin used as the absorptive thermoplastic resin that absorbs a laser beam is not particularly limited as long as thermoplasticity is imparted to such resin and the resin can absorb a laser beam as a heat source while not transmitting it. Examples thereof include resin obtained by mixing the following with a given coloring agent such as carbon black, dye, pigment, or the like: polyamide (PA) such as nylon 6 (PA6) or nylon 66 (PA66); polyethylene (PE); polypropylene (PP); styrene-acrylonitrile copolymer; polyethylene terephthalate (PET); polystyrene; ABS; polymethylmethacrylate (PMMA); polycarbonate (PC); polybutylene terephthalate (PBT); and PPS. In addition, resin to which reinforced fiber such as glass fiber or carbon fiber is added according to need may be used. The phrase "absorb a laser beam" indicates that laser beam transmissivity is preferably 10% or less, more preferably 5% or less, and further preferably 1% or less.
- In addition, preferably, a combination of resin used for a transmissive thermoplastic resin member and resin used for an absorptive thermoplastic resin member is a combination of resins compatible to each other. Examples of such combination include a combination of
nylon 6 and nylon 66, PET and PC, and PC and PBT, in addition to a combination of two resins of the same type such asnylon 6 andnylon 6, or nylon 66 and nylon 66. - In the laser welding method and apparatus of the present invention, the type of a laser beam used for the laser beam irradiation on contact surfaces of two members can be adequately selected based on the relationship between an absorption spectrum of a transmissive resin material that transmits a laser beam and the thickness of the member (transmission length), for example. Examples of such the laser beam include a laser beam generated by an Nd: glass (neodymium3+: glass) laser, an Nd: YAG (neodymium3+: YAG) laser, a ruby laser, a helium-neon laser, a krypton laser, an argon laser, a H2 laser, an N2 laser, or a semiconductor laser. More preferred examples thereof include a laser beam generated by an Nd: YAG laser (wavelength of the laser beam: 1060 nm) and a semiconductor laser (wavelength of the laser beam: 500 to 1000 nm).
- In addition, preferably, laser output power is 10 to 900 W. When the output power is less than 10 W, the output power is too low to melt the contact surfaces of the two resin members. When the output power exceeds 900 W, the excessive output power causes resin members to evaporate or deteriorate.
- With the use of the method and apparatus for laser welding thermoplastic resin members of the present invention, two members formed of thermoplastic resin can uniformly be welded with high welding strength. In addition, since it is possible to prevent burrs from being extruded from the welded portion, the quality of welded resin members can be enhanced. Further, using a low-output laser, the facility cost of which is low, high welding strength can be obtained even in the case of a resin member having a high melting point, so that variation in the strength can be reduced.
-
- Fig. 1 shows the configuration of the main part of one embodiment of the apparatus for laser welding according to the present invention.
- Fig. 2 shows the configuration of the main part of another embodiment of the apparatus for laser welding according to the present invention.
- Hereafter, one embodiment of the apparatus for laser welding thermoplastic resin members according to the present invention will be described in detail based on the drawings. Fig. 1 shows the configuration of the main part of the apparatus for laser welding thermoplastic resin members according to the present embodiment.
- In Fig. 1, with a
laser welding apparatus 1 for thermoplastic members of the present embodiment, afirst member 2 formed of transmissive thermoplastic resin that transmits a laser beam and asecond member 3 formed of absorptive thermoplastic resin that absorbs a laser beam are made to come into contact with each other, andcontact surfaces 4 are joined by melting using a laser beam. Further, thelaser welding apparatus 1 is a welding apparatus wherein the first member and the second member are made to come into contact with each other under a reduced pressure atmosphere, andcontact surfaces 4 of the two members are irradiated with a laser beam generated from alaser beam generator 10 from the side of the first member that transmits a laser beam, such that twomembers - The
laser welding apparatus 1 is equipped with a casing 5 that accommodates thefirst member 2 and thesecond member 3, and also is equipped with a pressure-reducing means such as avacuum pump 6 that reduces the pressure inside the casing to a level lower than that of the atmospheric pressure. The apparatus is composed in a manner such that thevacuum pump 6 functions to create a reduced pressure environment inside the casing 5, and twomembers laser welding apparatus 1 is equipped with thelaser beam generator 10, whereby at least one of the contact surfaces 4 of thefirst member 2 andsecond member 3 becomes melted. - The
laser beam generator 10 is composed of alaser oscillator 11 and alaser head 12 that is connected to the laser oscillator via optical fiber. Preferably, a laser beam irradiated from the laser head is a semiconductor laser beam having a wavelength of 940 nm, for example, and the output power thereof is approximately 10 to 900 W. To thelaser head 12, atransfer mechanism 13 that transfers the laser head upon welding at a processing speed of approximately 0.1 to 5 m/min, for example, is connected. The transfer means 13 that can appropriately be used is composed in a manner such that: a industrial robot is connected to thelaser head 12; members are transferred using a two-dimensional stage or three-dimensional stage; a focal point created by a combination of an optical lens and a mirror is controlled; or a plurality of portions are simultaneously irradiated using a plurality of laser heads. - The
first member 2 is formed with, for example, glass-reinforcednylon 6 as transmissive thermoplastic resin material. Thesecond member 3 is formed with, for example, resin material obtained by mixing glass-reinforcednylon 6 with carbon black or a coloring agent. Laser beam absorptivity is imparted to thesecond member 3 formed of absorptive thermoplastic resin material that has been mixed with carbon black or a coloring agent. In addition, thesecond member 3 absorbs a laser beam so that the laser energy accumulates within it, resulting in heat generation. - The
laser welding apparatus 1 is equipped with aclamp mechanism 15, whereby pressing force is imparted to twomembers members clamp mechanism 15 prevents the two members from being removed from each other due to volume expansion of the melted portion resulting from melting of the contact surface of at least one member via a laser beam. Theclamp mechanism 15 functions to achieve uniform welding of two members. Theclamp mechanism 15 that can be used is composed in a manner such that: two members are pressed against each other via a spring mechanism or the like; two members that have been placed on a base or the like are pressed from above; two members are pressed using fluid pressure such as hydraulic fluid pressure; or two members are pressed using compressed air. - The laser beam transmissivity of transmissive thermoplastic resin material that constitutes the
first member 2 and transmits a laser beam is preferably 20% or more, more preferably 50% or more, further more preferably 80% or more, and particularly preferably 90% or more. The laser beam transmissivity of absorptive thermoplastic resin material that constitutes thesecond member 3 and absorbs a laser beam is preferably 10% or less, more preferably 5% or less, and further more preferably 1% or less. Since the resin material that constitutes thesecond member 3 almost completely lacks the ability to transmit a laser beam, it can be referred to as non-transmissive thermoplastic resin material. Thesecond member 3 absorbs a laser beam while almost completely lacking the ability to transmit a laser beam. As a result, laser beam energy accumulates within it, resulting in heat generation. - Operation of the
laser welding apparatus 1 for thermoplastic members in the present embodiment, the configuration of which is as described above, will be hereafter described. Thefirst member 2 and thesecond member 3 are made to overlap each other in the casing 5 of thelaser welding apparatus 1. Twomembers clamp mechanism 15. The two members are disposed so as to overlap each other in a manner such thattransmissive member 2 faces thelaser head 12. Whenvacuum pump 6 is operated under such condition, the air in the casing 5 is discharged, resulting in reduction in the pressure inside such the casing. Preferably, the pressure is reduced so as to approach a vacuum state as nearly as possible. Specifically, the pressure preferably ranges from 0 to 1 kPa and more preferably from 0 to 0.1 kPa. - After reducing the pressure inside the casing 5, the
laser beam generator 10 is operated to direct laser beam R towardcontact surfaces 4 of twomembers contact surface 4 on the top side ofsecond member 3 that absorbs a laser beam, since laser beam R is focused on the contact surface using an irradiation lens inside the laser head. When a given quantity of energy is provided to contactsurfaces 4, the vicinity ofcontact surface 4 ofsecond member 3 becomes melted, followed by melting of the contact surface of thefirst member 2. Thus, both meltedportions 4a are fused together such that contact surfaces 4 of thefirst member 2 andsecond member 3 are fused together. As above, after bothcontact surfaces 4 of the two members have become melted, thelaser head 12 is transferred by thetransfer mechanism 13 so that the widths of meltedportions 4a are extended. As a result, the melted portions of two members can be continuously formed. - The
laser head 12 is transferred by thetransfer mechanism 13 such that all portions subjected to welding become melted. Thereafter, thelaser beam generator 10 is halted. After irradiation of laser beam R is halted, meltedportions 4a are cooled. At such time, the casing 5 contains rarefied air under reduced pressure conditions so that thermal diffusion is suppressed, which in turn results in suppression of thermal diffusion toward the outside of the system. Thus, the cooling rate of melted polymer is reduced, and the polymer is not quenched but slowly cooled, such that weldedportion 4b is formed. Since the melted portions are slowly cooled in such a manner, temperature fluctuations due to the shapes of members can be reduced. As a result, the degree of crystallinity of weldedportion 4b increases, resulting in the improvement of welding strength and reduction of variations in strength. In addition, since the pressure inside the casing 5 is reduced, the melting point of polymer per se decreases. Thus, it becomes possible to perform welding with a low-output laser beam, leading to facility cost saving. Further, even in case welding is performed under a reduced pressure environment, two members in their entirety are disposed under the reduced pressure atmosphere, resulting in a lack of occurrence of burrs. - As described above, in the
laser welding apparatus 1 of the present embodiment, thefirst member 2 formed of transmissive thermoplastic resin andsecond member 3 formed of absorptive thermoplastic resin are made to come into contact with each other under a reduced pressure atmosphere, andcontact surfaces 4 are irradiated with a laser beam from the side of thefirst member 2 that transmits a laser beam, such that two members are welded. Thus, thermal diffusion toward the outside of the system is suppressed so that melted polymer is slowly cooled. In addition, temperature fluctuations due to the shapes of members or the like are reduced. Therefore, the degree of crystallinity of the welded portion is improved, resulting in the increased welding strength, and leading to reduction of variations in strength. As a result, occurrence of burrs is suppressed so that welding quality is improved. - Another embodiment of the present invention will be described in detail based on Fig. 2. Fig. 2 shows the configuration of the main part of another embodiment of a laser welding apparatus for thermoplastic resin members according to the present invention. In addition, compared with the aforementioned embodiment, the present embodiment is characterized in that gas inside the casing that accommodates two members subjected to welding is replaced with a gas having low heat conductivity or an inert gas such that welding is performed. Here, detailed description is omitted in terms of the configuration of the other parts of the present embodiment, which is substantially similar to the configuration of the corresponding parts of the aforementioned embodiment, by applying the same reference numerals used in the aforementioned embodiment to the present embodiment.
- In Fig. 2, in the laser welding apparatus 1A for thermoplastic resin members of the present embodiment, the
first member 2 formed of transmissive thermoplastic resin that transmits a laser beam andsecond member 3 formed of absorptive thermoplastic resin that absorbs a laser beam are made to come into contact with each other, andcontact surfaces 4 are joined by melting using a laser beam irradiated from thelaser beam generator 10. In addition, the laser welding apparatus 1A is an apparatus in which the first member and the second member are made to come into contact with each other under an atmosphere containing a gas having low heat conductivity or an inert gas, andcontact surfaces 4 of the two members are irradiated with a laser beam from the side of the first member that transmits laser beam, so that twomembers - The laser welding apparatus 1A is equipped with the casing 5 that accommodates the
first member 2 and thesecond member 3. The casing is equipped with a gas supplying means 20 that supplies a gas having low heat conductivity or an inert gas, which is kept in agas container 21. The apparatus is composed in a manner such that gas inside the casing 5 is replaced with a gas having low heat conductivity or an inert gas by the gas supplying means 20; and twomembers - As described in the aforementioned embodiment, the
laser beam generator 10 is composed of thelaser oscillator 11 and thelaser head 12 that is connected to the laser oscillator via optical fiber. In addition, thetransfer mechanism 13, which transfers thelaser head 12 upon welding at a processing speed of, for example, approximately 0.1 to 5 m/min, is connected to the laser head. Further, the laser welding apparatus 1A is equipped with theclamp mechanism 15, with which pressing force is imparted to twomembers first member 2 and thesecond member 3 is omitted since the configuration thereof is equivalent to that in the aforementioned embodiment. - When the laser welding apparatus 1 A in the present embodiment is used for welding, the
first member 2 and thesecond member 3 are made to overlap each other in the casing 5 and twomembers clamp mechanism 15. Two members are disposed so as to overlap each other in a manner such that thetransmissive member 2 faces thelaser head 12. Under such conditions, the gas supplying means 20 is operated so that gas inside the casing 5a is replaced with a gas having low heat conductivity by supplying the gas thereinto, for example. A preferred example of such gas having low heat conductivity is a gas having heat conductivity lower than that of the air (0.0221 kcal/mh°C). Preferred examples thereof include nitrogen gas (0.0207 kcal/mh°C), carbonic acid gas (0.0125 kcal/mh°C), ammonia gas (0.0188 kcal/mh°C), and the like. - The
laser beam generator 10 is operated under conditions whereby the gas inside the casing 5 is replaced with a gas having low heat conductivity or an inert gas. Then, contact surfaces 4 of twomembers portions 4a are formed. A gas having low heat conductivity or an inert gas exists surrounding the two members, resulting in the restriction of the quantity of heat diffusion from the melted portions via such gas. Therefore, the polymer of meltedportions 4a is not quenched but is slowly cooled so that weldedportion 4b is formed. That is, heat diffusion toward the outside of the system is suppressed so that the cooling rate is reduced. As a result, the degree of crystallinity of weldedportion 4b is increased, resulting in the improvement of welding strength in the welded portion and the achievement of reduction of variations in strength. - As described above, in the laser welding apparatus 1 A of the present embodiment, two
members - The embodiments of the present invention have been described above in detail. However, the present invention is not limited to the aforementioned embodiments. Thus, various modifications can be made without departing from the spirit described in the scope of the claim of the invention. For instance, a laser oscillator and a laser head that constitute a laser beam generating means may be incorporated together so as to be disposed movably inside a casing.
- Needless to say, general-purpose thermoplastic resins, general-purpose engineering plastics, super engineering plastics, thermoplastic elastomers, and the like can be used, in addition to the thermoplastic resin described above. Preferably, transmissive thermoplastic resin that constitutes the first member and transmits a laser beam has a high transmissivity, while on the other hand, absorptive thermoplastic resin that constitutes the second member and absorbs a laser beam has a low transmissivity. Preferably, there is a great difference between the transmissivities of the two members.
- In the present invention, a first member made of transmissive thermoplastic resin and a second member made of absorptive thermoplastic resin, which have different laser beam transmissivities, are selected so that it is possible to perform welding, whereby welding strength can be improved and variations in strength can be reduced. Thus, the present invention can be applied to the welding of various types of resin products or resin components.
Claims (6)
- A method for laser welding thermoplastic members, wherein a first member formed of transmissive thermoplastic resin that transmits a laser beam and a second member formed of absorptive thermoplastic resin that absorbs a laser beam are made to come into contact with each other, and contact surfaces of the members are joined by melting using a laser beam, which is characterized in that:the first member and the second member are made to come into contact with each other under a reduced pressure atmosphere; andthe contact surfaces of the two members are irradiated with the laser beam from the side of the first member.
- A method for laser welding thermoplastic resin members, wherein a first member formed of transmissive thermoplastic resin that transmits a laser beam and a second member formed of absorptive thermoplastic resin that absorbs a laser beam are made to come into contact with each other, and contact surfaces of the members are joined by melting using a laser beam, which is characterized in that:the first member and the second member are made to come into contact with each other under an atmosphere containing a gas having low heat conductivity or an inert gas; andthe contact surfaces of the two members are irradiated with the laser beam from the side of the first member.
- The method for laser welding thermoplastic resin members according to claim 2, wherein the gas having low heat conductivity or the inert gas is nitrogen gas, carbonic acid gas, ammonia gas, helium gas, argon gas, or neon gas.
- An apparatus for laser welding thermoplastic resin members, wherein contact surfaces of a first member formed of transmissive thermoplastic resin that transmits a laser beam and a second member formed of absorptive thermoplastic resin that absorbs a laser beam are joined by melting using a laser beam, which is equipped with:a casing that accommodates the first member and the second member;a pressure-reducing means that reduces the pressure inside the casing; anda laser beam generator, whereby at least one of the contact surfaces of the first member and the second member becomes melted.
- An apparatus for laser welding thermoplastic resin members, wherein contact surfaces of a first member formed of transmissive thermoplastic resin that transmits a laser beam and a second member formed of absorptive thermoplastic resin that absorbs a laser beam are joined by melting using a laser beam, which is equipped with:a casing that accommodates the first member and the second member;a gas supplying means that supplies a gas having low heat conductivity or an inert gas into the casing; anda laser beam generator, whereby at least one of the contact surfaces of the first member and the second member becomes melted.
- The apparatus for laser welding thermoplastic resin members according to claim 5, wherein the gas supplying means supplies nitrogen gas, carbonic acid gas, ammonia gas, helium gas, argon gas, or neon gas.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005303798A JP2007111926A (en) | 2005-10-19 | 2005-10-19 | Method and apparatus for laser beam welding of thermoplastic resin member |
Publications (2)
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EP1777058A2 true EP1777058A2 (en) | 2007-04-25 |
EP1777058A3 EP1777058A3 (en) | 2007-05-30 |
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EP20060255340 Withdrawn EP1777058A3 (en) | 2005-10-19 | 2006-10-17 | Method and apparatus for laser welding thermoplastic resin members |
Country Status (6)
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US (1) | US20070084553A1 (en) |
EP (1) | EP1777058A3 (en) |
JP (1) | JP2007111926A (en) |
KR (1) | KR100808125B1 (en) |
CN (2) | CN1951675B (en) |
CA (1) | CA2564528C (en) |
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US8506872B2 (en) | 2009-05-29 | 2013-08-13 | Stanley Electric Co., Ltd. | Method for manufacturing resin mold assembly |
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WO2012070462A1 (en) * | 2010-11-22 | 2012-05-31 | 花王株式会社 | Method for producing body with fused sheets, and body with fused sheets |
JP5912431B2 (en) * | 2010-11-22 | 2016-04-27 | 花王株式会社 | Manufacturing method of sheet fusion body |
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JP5766252B2 (en) | 2013-11-01 | 2015-08-19 | 花王株式会社 | Pants-type wearing article and manufacturing method thereof |
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JP7069582B2 (en) * | 2016-10-17 | 2022-05-18 | 東洋製罐グループホールディングス株式会社 | Joining method |
CN106541209B (en) * | 2017-01-17 | 2018-02-09 | 镭蒙(苏州)微光学科技有限公司 | A kind of method and system for laser welding |
JP6884664B2 (en) * | 2017-08-14 | 2021-06-09 | スズキ株式会社 | Welding method of synthetic resin member |
CN110978126B (en) * | 2019-12-30 | 2020-12-01 | 台州市玺融车业有限公司 | Automatic punching welding method for automobile front bumper |
CN113681200B (en) * | 2021-09-27 | 2023-12-26 | 烟台佳隆纳米产业有限公司 | Cesium tungsten bronze heat absorber, preparation thereof and application thereof in transparent ABS infrared welding |
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Also Published As
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KR20070042883A (en) | 2007-04-24 |
CN1951675B (en) | 2010-06-16 |
CN1951675A (en) | 2007-04-25 |
JP2007111926A (en) | 2007-05-10 |
KR100808125B1 (en) | 2008-02-29 |
CA2564528A1 (en) | 2007-04-19 |
US20070084553A1 (en) | 2007-04-19 |
EP1777058A3 (en) | 2007-05-30 |
CA2564528C (en) | 2011-07-12 |
CN101352921A (en) | 2009-01-28 |
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